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Original design incorporating a leather bellows which was replaced by a piston. This image was published 1908 and 1909 A pair of SU carburettors from an MGB. The SU carburettor is a constant-depression carburettor that was made by a British manufacturer of that name or its licensees in various designs spanning most of the twentieth century.
A 4.6-litre Rover V8 engine with SU carbs, fitted to a Rover P6. In 1995, Land Rover enlarged the Rover V8 to 4,552 cc (4.6 L; 277.8 cu in). The bore remained the same size as the previous 4.0 at 94 mm (3.7 in), but the engine was stroked by 10.9 mm (0.43 in) giving 82 mm (3.23 in) in total.
It was succeeded by the Motorcraft 2150 carburetor. Flow rate is determined by the diameter of the venturi, which was cast into the float chamber side as a number within a circle representing the venturi size in inches: 0.98 - 190 cfm, 1.01 - 240 cfm, 1.02 - 245 cfm, 1.08 - 287 cfm, 1.14 - 300 cfm, 1.21 - 351 cfm, 1.23 - 356 cfm, 1.33 - 424 cfm [2]
In SU and other (e.g. Zenith-Stromberg) variable jet carburetors, it was mainly controlled by varying the jet size. The orientation of the carburetor is a key design consideration. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
Autolite 4300A Carburetor. The Autolite 4300 was a four-barrel (four venturi) carburetor manufactured by Autolite in multiple variants from 1967 through 1974. Used by both Ford and AMC, it was produced as an emissions-compliant replacement for the previous Autolite 4100 model, and was superseded by the Motorcraft 4350.
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The basic carburetor size can be selected by the butterfly valves, for DCO/DCOE the sizes are 38/40/42/45/48/50/55, with 40/45/48/50/55 being more common and available today. Jet size is based on choke size, and choke size is just based on engine displacement, RPM and application.
The Motorcraft 2150 is a Ford (also used by AMC) 2-barrel carburetor manufactured from 1973 through 1983, [1] based heavily on its predecessor, the Autolite 2100 carburetor. The 2150 improved on the 2100s design through the introduction of a variable air bleed system, which keeps the air to fuel mixture better balanced throughout the carburetor ...